[en] Radioactive iodine(I-131) is easily obtained by heating, at a temperature ranging from 600⁰C to 650⁰C, a tellurium oxide intermediate which was obtained by heating telluric acid or tellurium trioxide at a temperature from about 400⁰C to 560⁰C and was irradited with a neutron flux. Thus, pure I-131 is obtained without the complicated operations required in a conventional process for separation and/or purification of the product. 4 claims

No abstract available

[en] A compact removal equipment (TRE), assembled in a console with casters, has been developed for air cleanup of a glove box to be used for handling tritium in some 10 curies. The TRE was designed to remove gaseous tritium in the form of T₂, HT and CH₃T through oxidation with precious metal/alumina catalyst followed by adsorption in zeolite pellets. The present paper reports the results of air cleanup experiments of atmosphere in a glove box by using hydrogen tritide and the HT-to-HTO factional conversions determined under various conditions of catalyst temperature and the gas flow rate

[en] A fission ⁹⁹Mo plant was constructed in 1977 at the facilities of the Japan Atomic Energy Research Institute (JAERI). UO₂ pellets (2.6% enrichment) were utilized on target material containing 120g of UO₂. The pellets were irradiated in the JRR-2 and JRR-3 reactors up to 7 days at a neutron flux of 2 or 3 x 10¹³n/cm² x sec. About 20 Ci of ⁹⁹Mo per week was routinely produced for 39 weeks. However, due to severe constraints of a research establishment, commercial production runs had been stopped. This paper provides information on the target configuration, post-irradiation separation process and waste disposal problems. (author). 14 refs, 4 figs, 3 tabs

[en] Gaseous tritium was extracted from neutron-irradiated lithium aluminum alloys (⁶LiAl), containing 1% of ⁶Li enriched to 95%, by the use of Tritium Extraction System (TREX), a small scale test plant, constructed in the Japan Atomic Energy Research Institute (JAERI). TREX is a vacuum system made of stainless steel and consists of a vacuum furnace, a purifier, a tritium getter trap, and constant volumes to which analytical equipments are connected. The system was set in an airtight box surrounded with lead bricks of 5 cm thick. For the safe operation, Tritium Removal System (TRS) was furnished in the laboratory. TRS can remove tritium diffusing out of TREX into the atmosphere in the box by converting tritiated species to HTO, which is adsorbed on molecular sieves. TRS was operated at the flow rate between 1 and 7 m³h^-1 and the appropriate decontamination factor of 10⁴ was obtained in the test operation of a once-through mode

[en] Bilateral striatal necrosis in acute encephalopathy has been reported in a small number of adults with methanol or cyanide intoxication, hypoxic encephalopathy or haemolytic-uraemic syndrome. Acute encephalopathy with bilateral striatal necrosis has been reported in infants and children. However, the pathogenesis of the necrosis remains unclear. This is the first report of serial imaging from the very early yo chronic stage in two acute encephalopathic adults with bilateral striatal necrosis. A clinicoradiological study is presented for clarification of the pathological process and pathogenesis. Striatal lesions were not detected in the very early stages, but only thereafter. Serial studies suggested that the lesions were caused by delayed neuronal death. These patients had severe lactic acidosis, near the limit for survival. There hav ebeen few reports of adults with acute encephalopathy and bilateral striatal necrosis in whom arterial pH was described; all these exhibited marked acidosis. The common pathophysiological condition among these encephalopathies with bilateral striatal necrosis could be lactic acidosis elicited by impairnment of ATP generation through the Krebs cycle. The striatum might represent one of the target areas of Krebs-cycle blockade. (orig.)